Iterate over IEnumerable before disposing

MediaBrowser.Providers/Music/MusicBrainzAlbumProvider.cs

@@ -336,7 +336,7 @@ namespace MediaBrowser.Providers.Music
                                     }
                                     using (var subReader = reader.ReadSubtree())
                                     {
-                                        return ParseReleaseList(subReader);
+                                        return ParseReleaseList(subReader).ToList();
                                     }
                                 }
                             default:

MediaBrowser.Providers/Music/MusicBrainzArtistProvider.cs

@@ -110,7 +110,7 @@ namespace MediaBrowser.Providers.Music
                                         }
                                         using (var subReader = reader.ReadSubtree())
                                         {
-                                            return ParseArtistList(subReader);
+                                            return ParseArtistList(subReader).ToList();
                                         }
                                     }
                                 default: